1 //
2 // Copyright 1998 CDS Networks, Inc., Medford Oregon
3 //
4 // All rights reserved.
5 //
6 // Redistribution and use in source and binary forms, with or without
7 // modification, are permitted provided that the following conditions are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 // 3. All advertising materials mentioning features or use of this software
14 // must display the following acknowledgement:
15 // This product includes software developed by CDS Networks, Inc.
16 // 4. The name of CDS Networks, Inc. may not be used to endorse or promote
17 // products derived from this software without specific prior
18 // written permission.
19 //
20 // THIS SOFTWARE IS PROVIDED BY CDS NETWORKS, INC. ``AS IS'' AND
21 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 // ARE DISCLAIMED. IN NO EVENT SHALL CDS NETWORKS, INC. BE LIABLE
24 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 // SUCH DAMAGE.
31 //
32
33
34 package com.internetcds.jdbc.tds;
35
36
37 /***
38 * return a monotonically increasing number.
39 *
40 * This class provides a thread safe way of generating unique
41 * numbers. It is used in the TDS driver to help generate unique
42 * names for temporary stored procedures and temporary tables.
43 *
44 * @author Craig Spannring
45 * @version $Id: UniqueId.java,v 1.1 2003/04/29 18:07:53 sinisa Exp $
46 */
47 public class UniqueId {
48 public static final String cvsVersion = "$Id: UniqueId.java,v 1.1 2003/04/29 18:07:53 sinisa Exp $";
49
50 // next number to return from the getUniqueId() method
51 private static long id = 1;
52
53
54 /***
55 * return a unique number.
56 * <p>
57 * The number is unique for a given invocation of the JVM. Currently
58 * the number is monotonically increasing, but I make no guarantees
59 * that it will be that way in future releases.
60 *
61 * @return unique number
62 */
63 public static synchronized long getUniqueId()
64 {
65 return id++;
66 }
67 }
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